Here's some news you probably hoped you wouldn't hear for another four months. The National Weather Service says areas of northeast Minnesota and northwest Wisconsin could see patchy frost this weekend. That's right, patchy frost in August. The weather agency says clear skies could allow temperatures to dip into the low to mid-30s late Sunday night into early Monday morning. Meteorologists say an unusual cold-air mass from Canada will bring lower temperatures, but warmer air from the central Midwest should replace it by Monday. These temperatures are uncommon but not unheard of.